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The curve C is given by the equation y = (20x² + 6x + 5) sinx, where x E R.
identify the gradient of the curve at x = pi/2 well as the equation for the tangent to C at c= pi/2

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the height of a lamp post is 10√3m and the length of it's shadow due to the sun's ray is 30m what is the altitude of the sun

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